Before enter into organic farming one has to know about soil, soil nutrients and organic matters.  So I have explained about all those things  as follows.

SOIL

Soil is a mixture of minerals, air, water and organic materials, decaying plant and animal parts, fungi, earthworms, bacteria and microorganisms.

An acre of healthy topsoil can contain

900 pounds of earthworms,

2,400 pounds of fungi,

1,500 pounds of bacteria,

133 pounds of protozoa,

890 pounds of arthropods and algae and in some cases, small mammals.

Organic matter

Any part of a plant or animal, either living or dead leaves, roots, sticks, fruit, seeds, worms, insects, manure and food scraps are all examples of organic matter. The decomposition of organic matter provides the nutrients for the plants to grow. Organic matter also improves soil texture, and helps the soil to retain more water.

Soil nutrients

Plants need sunlight, water and a variety of different nutrients. In natural environment such as forests, plants obtain most necessary nutrients from minerals found within the soil. When these plants die, they fall to the ground, decompose, and release nutrients back into the soil, making them available for new plants. In this way, nutrients are "recycled" with each generation. But the recycle process in the soil decreases due to the burning of plants and dead animals in the fields.